It is a little bit strange.
It seems that I (User 1) am able to write a simple chat message from Nextcloud Talk app in my webbrowser. When I send this message to a User 2 with the Nextcloud Talk app on Android (version 6.0.3) it works. But the only way to react is to establish a voice/video call. A reply as text message is not offered / not possible.
That would mean that a textual chat in Talk works for a browser - browser connection only - not with a browser - Android app connection. Is that intentionally or did I miss something?
(My actual objective is to have a chat tool from Android to Androd. If Talk is unable to provide, I have to check for an independent XMPP server solution)